Gambling investment is zero or negative sum, considering the house has to profit.
So why are you guys do bitcoin gambling as an investment instruments? OR merely just for the fun, like going to a physical casino.
If you are INVESTING in casinos, that means you ARE the house. Which means that you are going to profit in the long term because the house edge stands on your side. The more people gamble, theoretically the more you are going to profit.
So no, gambling investments are actually +EV and that's why people do invest in the house.
I think you might have confused "gambling" and "gambling investment". If you are gambling then obviously you should be doing so for fun and not the profit, and if you try to go for the profit eventually you'll lose in the long run.